I suggest adding one new line to each catalog page. There we can indicate what to pay special attention to, what is variable on coins of this type. For example: mintmark may be larger or smaller, or erased, rotated or inverted. So when you have 1000 coins of this type, you will look first at the mintmarks because you may be sure that all other elements are similar on all coins.
Also, date numbers may be different. Presence and absence of engraver´s signature. And so on.
